in the flood zone tonight. And the race for 2016 heating up. Donald Trump under fire for controversial comments. Did he make a derogatory comment about a female candidate's looks? Here's Tom llamas. Reporter: Tonight, Donald Trump on defense after attacking Carly fiorina. Telling "Rolling stone" -- look at that face! Would anyone vote for that? Can you imagine that, the face of our next president? This morning on "The view," trump insisting he wasn't referring to fiorina's looks. I'm talking about her persona. She failed miserably at Hewlett Packard and ran for the senate and lost in a landslide and now running for president. I'm talking about her persona. Why don't you talk about her brain instead of her face? Reporter: Jeb bush calling trump's remarks "Demeaning." Maybe, just maybe, I'm getting under his skin a little bit because I am climbing in the polls. Reporter: Trump also tangling with his closest competition in the polls, Dr. Ben Carson, after Carson was asked how he's different from the billionaire. I've realized where my success has come from, and I don't in any way deny my faith in god. Reporter: This morning, trump firing back. I don't think he's a great religious figure. I saw him yesterday quoting on humility and it looked like he memorized it two minutes before he made the quote. Reporter: Dr. Carson told me today he's been a Christian his whole life, and will turn the other cheek when it comes to trump. I'm not going to get into the mud and start saying dirt. That's not the kind of person I am. Reporter: Tom llamas, ABC news, Houston. Tom, thanks. Still much more ahead on

This transcript has been automatically generated and may not be 100% accurate.

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